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In processing core every parameters can be optional but in scripts there is no way to define a parameter as optional and in modeler only layers can be optional. For script, I propose a notation like output, if a parameter token starts with optional the parameter is optional. For model, I propose to add the required combobox to all parameters. This proposition does not change the value setter. This proposition can fix the issue http://hub.qgis.org/issues/5488.